<template>
	<div class="goods">
		<div class="meun-wraper" ref="menuWraper">
			<ul>
				<li class="menu-item" v-bind:class="{'current':currentIndex===index}" v-for="(item, index) in goods" v-on:click="selectMenu(index,$event)">
					<span class="text border-1px">
						<span v-show="item.type>0" class="icon" v-bind:class="classMap[item.type]"></span>{{item.name}}
					</span>
				</li>
			</ul>
		</div>
		<div class="foods-wraper" ref="foodsWraper">
			<ul>
				<li v-for="item in goods" class="food-list food-list-hook">
					<h1 class="title">{{item.name}}</h1>
					<ul>
						<li v-for="food in item.foods" class="food-item" @click="selectFood(food,$event)">
							<div class="icon">
								<img width="57" height="57" v-bind:src="food.icon" alt="" />
							</div>
							<div class="content">
								<h2 class="name">
									{{food.name}}
								</h2>
								<p class="desc">{{food.description}}</p>
								<div class="extra">
									<span class="count">月售{{food.sellCount}}份</span>
									<span>好评率{{food.rating}}%</span>
								</div>
								<div class="price">
									<span class="now">￥{{food.price}}</span>
									<span class="old" v-show="food.oldPrice">￥{{food.oldPrice}}</span>
								</div>
								<div class="cartcontrol-wraper">
									<cartcontrol @cartAdd="addFood" :food="food"></cartcontrol>
								</div>
							</div>
						</li>
					</ul>
				</li>
			</ul>
		</div>
		<shopcart ref="shopcart" :select-foods="selectFoods" :delivery-price="seller.deliveryPrice" :min-price="seller.minPrice"></shopcart>
		<food :food="selectedFood" ref="food"></food>
	</div>
</template>

<script type="text/ecmascript-6">
	import BScroll from 'better-scroll';
	import shopcart from '../shopcart/shopcart.vue';
	import cartcontrol from '../cartcontrol/cartcontrol.vue';
	import food from '../food/food.vue';

	const ERR_OK = 0;

	export default {
		props: {
			seller: {
				type: Object
			}
		},
		data() {
			return {
				goods: [],
				listHeight: [],
				scrollY: 0,
				selectedFood: {}
			};
		},
		computed: {
			currentIndex() {
				for(let i = 0; i < this.listHeight.length; i++) {
					let height1 = this.listHeight[i];
					let height2 = this.listHeight[i + 1];
					if(!height2 || (this.scrollY >= height1 && this.scrollY < height2)) {
						return i;
					}
				}
				return 0;
			},
			selectFoods() {
				let foods = [];
				this.goods.forEach((good) => {
					good.foods.forEach((food) => {
						if(food.count) {
							foods.push(food);
						}
					});
				});
				return foods;
			}
		},
		created() {
			this.classMap = ['decrease', 'discount', 'special', 'invoice', 'guarantee'];
			this.$http.get('/api/goods').then((response) => {
				response = response.body;
				if(response.errno === ERR_OK) {
					this.goods = response.data;
					this.$nextTick(() => {
						this._initScroll();
						this._calculateHeight();
					});
				}
			});
		},
		methods: {
			selectFood(food, event) {
				this.selectedFood = food;
				this.$refs.food.show();
			},
			addFood(target) {
				this._drop(target);
			},
			_drop(target) {
				this.$nextTick(() => {
					this.$refs.shopcart.drop(target);
				});
			},
			_initScroll() {
				this.menuScroll = new BScroll(this.$refs.menuWraper, {
					click: true
				});
				this.foodsScroll = new BScroll(this.$refs.foodsWraper, {
					click: true,
					probeType: 3
				});
				this.foodsScroll.on('scroll', (pos) => {
					this.scrollY = Math.abs(Math.round(pos.y));
				});
			},
			_calculateHeight() {
				let foodList = this.$refs.foodsWraper.getElementsByClassName('food-list-hook');
				let height = 0;
				this.listHeight.push(height);
				for(let i = 0; i < foodList.length; i++) {
					let item = foodList[i];
					height += item.clientHeight;
					this.listHeight.push(height);
				}
			},
			selectMenu(index, event) {
				if(event._constructed) {
					let foodList = this.$refs.foodsWraper.getElementsByClassName('food-list-hook');
					let el = foodList[index];
					this.foodsScroll.scrollToElement(el, 300);
				}
			}
		},
		components: {
			'shopcart': shopcart,
			'cartcontrol': cartcontrol,
			'food': food
		}
	};
</script>

<style lang="less">
	@import '../../common/less/z.less';
	@import '../../common/less/css3.less';
	@import '../../common/less/appstyle.less';
	.goods {
		display: flex;
		.pos(a);
		top: 174px;
		bottom: 46px;
		width: 100%;
		overflow: hidden;
		.meun-wraper {
			flex: 0 0 80px;
			width: 80px;
			background: #f3f5f7;
			.menu-item {
				display: table;
				height: 54px;
				width: 56px;
				padding: 0 12px;
				line-height: 14px;
				.font-s14();
				&.current {
					.pos(r);
					margin-top: -1px;
					.font-s12();
					background: #fff;
					.font-wb();
					.text {
						.border-no();
					}
				}
				.icon {
					.d-ib();
					.wh(12px);
					margin-right: 4px;
					.bg-sz(12px, 12px);
					.bgr-no();
					&.decrease {
						.bg-image('../../../resource/img/decrease_1@2x.png', '../../../resource/img/decrease_1@3x.png');
					}
					&.discount {
						.bg-image('../../../resource/img/discount_1@2x.png', '../../../resource/img/discount_1@3x.png');
					}
					&.guarantee {
						.bg-image('../../../resource/img/guarantee_1@2x.png', '../../../resource/img/guarantee_1@3x.png');
					}
					&.invoice {
						.bg-image('../../../resource/img/invoice_1@2x.png', '../../../resource/img/invoice_1@3x.png');
					}
					&.special {
						.bg-image('../../../resource/img/special_1@2x.png', '../../../resource/img/special_1@3x.png');
					}
				}
				.text {
					display: table-cell;
					width: 56px;
					vertical-align: middle;
					.border-1px(rgba(7, 17, 27, 0.2));
					.font-s12();
				}
			}
		}
		.foods-wraper {
			flex: 1;
			.title {
				padding-left: 14px;
				.l-h(26px);
				border-left: 2px solid #d9dde1;
				.font-s12();
				color: rgb(147, 153, 159);
				background: #f3f5f7;
			}
			.food-item {
				display: flex;
				margin: 18px;
				padding-bottom: 18px;
				.border-1px(rgba(7, 17, 27, 0.2));
				&:last-child {
					.border-no();
					margin-bottom: 0;
				}
				.icon {
					flex: 0 0 57px;
					margin-right: 10px;
				}
				.content {
					flex: 1;
					.name {
						margin: 2px 0 8px 0;
						.l-h(14px);
						.font-s14();
						color: rgb(7, 17, 27);
					}
					.desc {
						margin-bottom: 8px;
						line-height: 12px;
						.font-s10();
						color: rgb(147, 153, 159);
					}
					.extra {
						line-height: 10px;
						.font-s10();
						color: rgb(147, 153, 159);
						&.count {
							margin-right: 12px;
						}
					}
					.price {
						.font-wb();
						line-height: 24px;
						.now {
							margin-right: 8px;
							.font-s14();
							color: rgb(240, 20, 20);
						}
						.old {
							text-decoration: line-through;
							.font-s10();
							color: rgb(150, 150, 150);
						}
					}
					.cartcontrol-wraper {
						.pos(a);
						right: 0;
						bottom: 5px;
					}
				}
			}
		}
	}
</style>